GTV 21-6w

Performance Data and Geometry

Pattern and VSWR

With Ground Gain

Stacking

GTV 21-6w with bent Dipole

21.00 to 21.45 MHz - 15 m band Yagi. The bent DE (K6STI style) transforms to 50 ohms at feed point for direct feed.
Design, date of issue: 2026.07.05

GTV 21-6w
Current distribution

Performance Data (21.1 MHz)


Gain vs. isotr. Rad.  11.4 dBi
Gain vs. Dipole        9.2 dBD
-3 dB E-plane         49.0 deg.
-3 dB H-plane         62.0 deg.
F/B                  -27.5 dB
F/R                  -16.8 dB
Impedance               50 ohms
Mechan. Length       14133 mm plus boom offsets
Electr. Length        0.99 λ

Stacking Dist. h-pol. (21.10 MHz)
top-to-bottom         13.8 m

Geometry

For building on a 60-70 mm boom, 25 mm mid-element tubes insulated with hydraulic clamps like from co. Stauff:

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Pattern and VSWR Plots

Elevation and Azimuth plot at 21.20 MHz

SWR and Return Loss plots - simulated with 4nec2

Radiation pattern with Ground Gain

At 14 m above perfect ground

At 14 m above perfect ground


Gain vs. isotr. Rad.  16.9 dBi  at  14 deg.
Gain vs. Dipole       14.8 dBD
F/B                  -29.2 dB   at 168 deg.

At 24 m above perfect ground


Gain vs. isotr. Rad.  17.2 dBi  at   8 deg.
Gain vs. Dipole       15.1 dBD
F/B                  -27.1 dB   at 172 deg.

Stacking

73, Hartmut, DG7YBN